Comfort food that feels special but is simple to make: Chicken and Spinach Stuffed Shells are the kind of dish you can serve for a weeknight family dinner or bring to a potluck and look like a hero. Jumbo pasta shells cradle a creamy, cheesy filling of shredded chicken, fresh spinach, ricotta and cream cheeses, seasoned with garlic, onion and Italian herbs. Topped with marinara and melted mozzarella, this casserole is richly satisfying without being fussy. Below you’ll find a full ingredient list, helpful prep tips, and clear, step-by-step directions rewritten for ease and success.

Ingredients

1 (12-ounce) box uncooked jumbo pasta shells
2 cups chopped cooked chicken
2 cups fresh chopped spinach
1 onion, chopped
2 cloves garlic, minced
1 (15 oz) container ricotta cheese
2 (8 oz) packages cream cheese, softened
1 (5 oz) package shredded Parmesan cheese (about 1 2/3 cups)
1 large egg, lightly beaten
1 Tablespoon dried parsley flakes
1 teaspoon Italian seasoning
1/2 teaspoon salt
1/2 teaspoon pepper
2 cups shredded mozzarella cheese, divided
1 (26 oz) jar prepared spaghetti sauce (If you like it saucier use more)

Notes Before You Start

Plan about 15 minutes of active prep and 30–40 minutes of baking time. The listed amounts are balanced to stuff roughly 24–30 jumbo shells, depending on shell size and how full you fill each one. For even melting and easy serving, let the baked casserole rest 5–10 minutes before scooping. If your chicken is not yet cooked, roast, poach, or sauté chicken breasts or thighs until fully cooked, then chop or shred to measure 2 cups.

Why this version works

This recipe keeps the flavor profile familiar: garlic and onion for depth, Italian seasoning and parsley for brightness, and a blend of ricotta, cream cheese and Parmesan for a creamy, slightly tangy filling. Fresh spinach adds color, nutrients and a tender bite. Using prepared spaghetti sauce saves time but still allows the dish to feel homemade. The method below ensures every shell is evenly filled, sauced and baked until bubbly.

Step-by-step Directions

Preheat and prepare the pasta: Preheat your oven to 375°F (190°C). Bring a large pot of salted water to a boil. Add the 1 (12-ounce) box of uncooked jumbo pasta shells and cook according to package directions until shells are al dente—tender but with a slight bite so they hold their shape when stuffed. Drain the shells and transfer to a rimmed baking sheet or a large bowl. To prevent sticking, drizzle a little olive oil over them or gently toss with a small amount of oil and separate the shells as they cool.
Sauté the aromatics and spinach: While the pasta cooks, heat a tablespoon of oil in a skillet over medium heat. Add the 1 chopped onion and sauté until softened and translucent, about 5 minutes. Add the 2 cloves minced garlic and sauté for 30–60 seconds until fragrant. Add the 2 cups fresh chopped spinach and cook until just wilted, about 1–2 minutes. Remove the skillet from the heat and let the mixture cool slightly before adding to the cheese filling.
Make the filling: In a large mixing bowl, combine 1 (15 oz) container ricotta cheese and 2 (8 oz) packages cream cheese that have been softened. Beat or stir until the mixture is smooth and creamy. Add the cooked onion, garlic and wilted spinach mixture, then fold in 2 cups chopped cooked chicken. Mix in 1 (5 oz) package shredded Parmesan cheese (about 1 2/3 cups), 1 large egg lightly beaten, 1 Tablespoon dried parsley flakes, 1 teaspoon Italian seasoning, 1/2 teaspoon salt and 1/2 teaspoon pepper. Stir until all ingredients are evenly distributed and the filling feels cohesive. Reserve 1 cup of the shredded mozzarella for topping and stir the remaining mozzarella into the filling so it is evenly distributed.
Prepare the baking dish with sauce: Spread a thin, even layer of the 1 (26 oz) jar prepared spaghetti sauce across the bottom of a 9×13-inch baking dish (or a similar-sized casserole). This base layer prevents sticking and ensures each shell gets saucy flavor from below. If you prefer a saucier final dish, pour a little more sauce into the bottom of the dish now—just keep some for spooning over the tops of the shells later.
Stuff the shells: Working one shell at a time, gently open each cooked jumbo shell and spoon about 2–3 tablespoons (depending on shell size) of the filling into the center. Place each stuffed shell, seam side up, in the prepared baking dish over the sauce. Arrange them snugly but not tightly in single or double rows—the shells will warm and expand slightly in the oven. Continue until all shells are filled and placed in the dish.
Add sauce and cheese: Once all shells are arranged, spoon the remaining spaghetti sauce over the tops of the shells so each shell has a coating of sauce. Sprinkle the reserved 1 cup shredded mozzarella evenly over the sauced shells to create a golden, melty top layer.
Bake until bubbly: Cover the baking dish loosely with aluminum foil and bake in the preheated 375°F (190°C) oven for 20 minutes. After 20 minutes, remove the foil and continue baking 10–15 minutes more, or until the cheese on top is melted and bubbly and the sauce is heated through. If you like a more browned top, switch to the oven’s broil setting for 1–2 minutes—watch closely so it doesn’t burn.
Rest, garnish and serve: Remove the dish from the oven and let it rest 5–10 minutes to set. This makes it easier to scoop neat portions. Garnish with a sprinkle of additional dried parsley or a few torn fresh basil leaves if you like. Serve each portion with a generous spoonful of sauce and a side salad, steamed vegetables, or garlic bread.

Make-ahead and storage tips

Assemble the stuffed shells in the baking dish, cover tightly with plastic wrap or foil, and refrigerate for up to 24 hours before baking. Increase baking time by 10–15 minutes if baking straight from the refrigerator, or let sit at room temperature for 15–20 minutes before baking.
To freeze, fully assemble and freeze the unbaked dish tightly wrapped in foil for up to 3 months. Bake from frozen: remove any plastic wrap, keep foil on, and bake at 375°F (190°C) for 45–55 minutes, removing foil for the final 10–15 minutes so the cheese can brown.
Leftovers keep well covered in the fridge for 3–4 days. Reheat individual portions in the microwave or rewarm the whole dish at 350°F (175°C) until heated through, about 20–30 minutes depending on depth.

Variations and swaps

Spinach: If you prefer, swap fresh chopped spinach for frozen spinach (10–12 ounces), thawed and well-drained before adding to the filling.
Cheese: For a lighter texture, use part-skim ricotta or reduce the cream cheese by one 8-ounce package and add a little more ricotta. You can also stir in shredded provolone or fontina for a different melty character.
Sauce: Use a chunky tomato basil sauce, arrabbiata for heat, or a roasted garlic marinara for deeper flavor. For extra sauciness, reserve 1/2 cup of sauce to spoon over each serving.
Herbs: Fresh basil, oregano or parsley can replace or supplement the dried parsley flakes and Italian seasoning. Add fresh herbs to the filling for a brighter finish.

Serving suggestions

This casserole pairs beautifully with a crisp green salad dressed with lemon vinaigrette, steamed green beans tossed with olive oil and lemon zest, or slices of crusty bread to mop up extra sauce. For a heartier plate, serve alongside roasted root vegetables or a simple grain salad.

Final notes

Chicken and Spinach Stuffed Shells deliver a creamy, comforting meal that’s easy to scale up for guests. The flavors are familiar and family-friendly, and the make-ahead flexibility makes it a winner for busy evenings or entertaining. Follow the step-by-step directions above, and you’ll have a bubbling, cheesy casserole with tender shells and a savory chicken-spinach filling every time.

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Chicken and Spinach Stuffed Shells

Cheesy chicken and spinach stuffed jumbo shells baked in marinara for a comforting family-friendly casserole.

Prep Time20

Cook Time35

Total Time55

Servings: 8 servings

Ingredients

1 box (12-ounce) uncooked jumbo pasta shells
2 cups chopped cooked chicken
2 cups fresh chopped spinach
1 onion, chopped
2 cloves garlic, minced
1 container (15 oz) ricotta cheese
2 packages (8 oz each) cream cheese, softened
1 package (5 oz) shredded Parmesan cheese about 1 2/3 cups
1 large egg, lightly beaten
1 Tablespoon dried parsley flakes
1 teaspoon Italian seasoning
1/2 teaspoon salt
1/2 teaspoon pepper
2 cups shredded mozzarella cheese, divided reserve 1 cup for topping
1 jar (26 oz) prepared spaghetti sauce use more if you prefer it saucier

Instructions

Preheat the oven to 350°F (175°C). Lightly grease two 9x13-inch baking dishes.
Cook the jumbo pasta shells according to package directions until al dente; avoid overcooking so shells hold their shape. Drain and spread shells in a single layer on a baking sheet or cutting board so they don't stick.
In a large bowl, combine the chopped cooked chicken, chopped spinach, chopped onion, minced garlic, ricotta, softened cream cheese, shredded Parmesan, beaten egg, dried parsley, Italian seasoning, salt, pepper, and 1 cup of the shredded mozzarella. Stir until evenly combined.
Fill each shell with the chicken and cheese mixture. For an easier method, spoon the filling into a gallon zip-top bag, snip off a corner, and pipe the filling into the shells.
Spread half of the spaghetti sauce across the bottom of the prepared baking dishes. Arrange the filled shells over the sauce in a single layer, then spoon the remaining sauce over the shells.
Cover the dishes tightly with heavy-duty aluminum foil and bake for 40 minutes. If freezing one pan for later, freeze at this stage and include the reserved mozzarella to add when baking.
Remove the foil, sprinkle the remaining 1 cup of mozzarella over the shells, and bake uncovered for an additional 5 to 10 minutes until the cheese is melted and bubbly.

Equipment

Large Pot
Colander
Large Mixing Bowl
9×13 baking dish
Aluminum Foil
baking sheet or cutting board
zip-top bag (optional)
Spoon or small spatula

Notes

Do not overcook shells or they may tear when filling.
For easier filling, pipe the mixture using a zip-top bag with the corner snipped.
Freeze one assembled pan before baking if making ahead; add reserved mozzarella when baking.
Use extra sauce if you prefer a saucier casserole.